Casing for downdraft-furnaces.



KARL PRINZ ZU LWENS'EIN.

CASlNG FOR DOWN DRAFT FURNCES.

` APPLICATION FILED JULY 18. 1913- l IQQQSG Patented May 25,- 191.5a

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CASING FOB Macnee. l

Specication of Iietters Patent.

RMT-FURNACES.

Araten-.ea may 25,1915.

applicati@ inea July 1s, 1913; serial nu. 779,824. 1

To all whom t may concern:

Be it known that I, KARL PRINZ ZU LwnNs'rnIN, a citizen of the GermanEm'- pire, residing' at Neckargemnd, in the GrandDukedom of Baden,Germany, have invented certain new and useful Improvements in Casingsfor Downdraft-Furnaces; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention has for its object a frame or casing for the rebrickmasonry of the combustion chambers of furnaces with a bottom Hue. Thecasing enables very thin masonry to be employed in order to reducey as-far as possible the weight of the apparatus.

The furnace shell must, in order to avoid too rapid a destruction of thethin flrebrick lining, prevent the masonry becoming too highly heated,that is to say, must cool it,

utilizing the heat withdrawn. Further, the casing must also be able toabsorb the heat flowing through the masonry, in order that loss of heatmay not take place. The casing itself must also be of rigidconstruction, and afford themasonry built in it a secure hold and a goodanchorage, and it must also be simple in construction', cheaply made,andl quite safe, so that on any portion of the casing becoming defectiveno danger is involved in working the apparatus. Finally, the casing mustbe durable in working, that is to say it must not become stopped withboiler scale in' a short time, which would prevent a circulation of thecooling fluid.

The tubular frame or casing according to this invention entirely fulfilsthe above-mentioned requirements, and for this purpose consists of` anumber of continuous pipes arranged close together, in which pipes thesame liquid constantly circulates.

The pipes may be combined into groups composed ofany suitable number ofpipes, each tubular elementbeing connected bylan up and down pipe with acooling coil or the like which is located in a steam-boiler or othercooling vessel and by means of which the heat absorbed from the (pipesof the casing or frame is transmitte to the cooling vessel and madeavailable in the latter.

The invention will now be more particularly described with reference tothe accompanying drawings in which one form of construction isillustrated as an example.

F1gure 1 is a longitudinal section of a furnace flue provided with theimproved casing or shell, number of the pipes being combined into o netubular element; Fig. 2 is a cross section of the furnace Hue; whileFig. 3 is a perspective view of the arrangement of the shell. p

The furnace flue a is lined with a thin layer of re brick masonry b, andthis masonry, according to' this mvention, is surp rounded by a casingor frame consisting of a number of continuous pipes c lying closelytogether. IThe separate pipes may be com'- bined. in any suitable numberto form tubular elements in which the same cooling liquid constantlycirculates. This absorbs the heat passing -through the masonry b andthus cools the latter. The heated liquid rises through the pipe dandflows through a cooling coil f placed in a steam boiler g or the like,to the water ofl which it imparts its heat.

The cooled liquid Hows back again to the same tubularelement through thedown pipe e inorder to re-commence the same circulation. The combinationof a number of pipes into a tubular element has the advantage of aconsiderable saving of wei 'ht and a cheaper construction ofthe coolingportion of the tubular element, and further a considerable stiffeningofthe element itself is obtained, whereb the irebrick masonry builttherein obtalns a secure hold.

The way in which the pipes are combined with one another to form tubularelements and also the particular construction of the cooling arrangementis immaterial as regards the essential feature of the invention.

I declare that what claim is 1. In a water-cooled furnace, thecombination of a thin lining of refractory brick masonry; a pluralityof'closely spaced pipes surrounding said lining in contact therewith;upper and 'lower conduits above and below said linin and connecting thepipes in groups; a circulation pipe connecting each upper conduit withthe corresponding lower conduit; and a heat exchange device associatedwith the circulation pipe.

2. In a water-cooled casing for refractory masonry for furnaces, thecombination of a plurality of groups of pipes lying close together;conduits connecting one group of pipes with another; and a heat exchangede-v vice in the conduits.

3.' In a waterv'cooled lfurnace, the combination of a thin lining ofrefractory material; a plurality of closely spaced water conductingpipes surrounding said lining in contact therewith and a heatexchangecde- Vice connected with said pipes.

4. In a water-cooled furnace, the cohibination of a thin lining 'ofrefractory material; and a pluralityl of closely spaced water conductingpipes surrounding said lining in contact therewith, said pipes anddevice forining a closed system through which the same water circulatesrepeatedly. 15 In testimony whereof I aHX my signature,

in presence of two witnesses.

, KARL PRINZ zu LWENSTEIN.

Witnesses WALTER SCHWARBACH, PAULINE MILER.

